Drop hammer



Patented Dec. 6, 1927.

PATENT OFFICE.

fromduffel st am, or Human; commi ASSIGNOR me man m mas a The inventionis an improvement in die SPENCER companies marronn, oonnnc'rioujr, aCORPORATION" OF CON-1 i :onor HAM ER.

Application area April -1, 1925. Serial No. 18,842.

bunters for the lower dies of drop hammers. Heretofore such dies havebeen secured to a shoe which 'issecured in an undercut groove in thehammer base and tightenedtherein" by means of a wedge 'drivenbetween'the edge of the shoe and the side of" the groove in.

the base; The attachment of the die'to'the shoe-has b eenjmade bymeansof an under-jcuttenon groove-also made tight by. a

' wedgeand secured againstinovement on the shoe, in the direction of thetenon and groove, bymeans of the usual'diebunters whichare fixedinthekshoel Insuch mounting the vibration of: the hammer shocks hasatendency "to displace the shoe in its groove therebyshifting-the'die-out of registry with the up-' per die carried bythereciprocating hammer. The effort to prevent such displacement as byfurther tightening the shoe wedge, has

resulted in the] fracture, by splitting, of

many hammer bases, and'consequent loss of time-and expense, and suchmounting has'the a.

further objection that work must be interrupted from time to time' inorder to tighten According to the the usual bunters to secure the dierelatively to the shoe and substituting for them a pair of cross barsformin'g a dir'ect'connection betweenthe dieand the base or frame- V ofthe'hammer' independently of the-shoe,

as below explained In the accompanying drawings Figure .1"

represents a drop hammer having the invention applied;

Figure 2 a horizontal enlarged plan of the hammer base; I

Figure 3 a central vertical section thereof; and, I s

Figure 4 a detail section of the hunter bar seat.

Thedrop hammer shown willbe under stood to represent nothingmore than aconventionaltype ofboard drophammer, 1 be-I ing the base casting, 2 theuprights which carry the hammerguides 3, and 4 being the head structurein which'the lifting rolls and a board clamp are mounted. In the presentcase the head structure has two pairs of I lifting rolls, but this fact"has no bear-' ing on the present invention. The frame resent inventionthese objections are overcomejby' domg away w th rear of the frame.

uprights 2 are keyed and adjustably bolted to the base in the usual, orin any sultable manner not necessary to 'be' described, and the base 1isprovided, between the uprights, with the usual undercut groove orotheriseat,'to' receive the shoe 5 which latter is tightened therein bythe Wedge 6 or by any other equivalent means. The die 7 is secured 'tothe shoe by means of a dovetailed tenon 8 wedged in an undercut grooveln the, top of the shoe, by the wedge 9 as customary. V

Sidewise or lateralregistry of the lower die 7' with the upper dielO,carried on the hammer 11, is established by lateralbodily adjustmentofthe uprights 2 with respect to the base; the means for such adjustmentare only partially indicated in the drawings,

but are well understood. Registry of the die.

in a depthwise or front and rear direction is produced in the firstinstance and thereafter maintained bythe two clamp screws 12, each ofwhich is carried in the central region of a bunter bar 13. These barsspan the central opening of the hammer frame at frontand rear, and arefirmly clamped or 80 otherwise secured to the frame at their ends.Preferably the bars areseated in sockets '14 formed in the upper cornersof the base castis I ingitself underneath the bottom surfaces of i the,uprights 2, which surfaces form the upper wa'llsof the sockets, as shownmore clear: ly in Fig.4, and" they are clamped in these sockets bythe'two tie bolts 15-, which tie them rigidly togetherand againstthefront and The tie bolts thus act as tension members to take thestrain of the the bunter screws 12 .and the sockets keep cross bars fromworking out of position,

vertically, under the effect of vibration; they also assist inassembling the" bars and tie bolts in ,theframe as will be evident.

. Itwill be apparent that the hunter bars as thus organized hold the diein fixed relation to the frame or base of the hammer, independently ofthe shoe, and in consequence,

that any" displacement which may occur of the latter will not affect thedie. Accordingly it is not necessary .to tighten the wedge 6 to anextent that might endanger the base casting, nor is it necessary todrive either thewedge 6 or thedle-wedge 9 as tightly, nor

as often, as formerly, while the cross bunter hummer, the combination of2. Inc drop hammer, the combination of a the hammer base, it shoeremovably seated thereon, edie removablyseated on the shoe and a hunterfor the die comprising across her engaged by its ends with seats on thehammer frame adapted to prevent vertical displacement of said bar andprovided with means tohold the die.

3. In a drop hammer, the combination of i the hammer uprights and base,a shoe secured on the base, a diesecured on the shoe and abunter for thedie comprising a cross bar engaged with Sockets in the hammer frame,said sockets bein 1 formed in part by corner recesses in the the;casting and in part by the under surfaces of said uprights.

41. In a. drop hammer, the combination of the hammer frame including itsbase, a shoe secured to the base, a die secured to the shoe,

a cross bar hunter for the die spanning the central opening of thehammer frame, tension members clamping the ends of said hunter to theframe and a clamp screw in a the hunter her adapted to hold the die.

5. In a. drop hz'mnner, frame having a base portion, uprights arisingtherefrom, a

hammer guided in said uprightsfor reeiproosting vertical motion, a. shoeon said base between uprights, a die adjustably use 7 cured to saidshoe. and a clamping device for adjusting said die and holding it inposition i and including a bar extending across the front of the innieand supported at its ends see, a shoe removnbly seated the machine tospecification.

thereagainst, a bar extending across the beclr of the frame andsupported at its ends thereagainst tie rods connecting said. bars and ajustable screws carried by said but: and engaging said die.

6. In a drop hammer, a base portion, a pair of uprightsrisinghtherefrom, a hammer guided in said uprig ts for reciprocatinverticalimotion, a shoe removably positione in said base between saiduprights, a die removebly atteehedto said shoe, and a removable barsecured to said base independently ofiseid shoe and provided with nelmaifor holding said die in adjusted position I'M"? to the diecarried by midhammer. a a

7. In a drop hammer, in imme a base and a. of uprights rising themefrom, a vertically reeiplmting hummer guided in said uprights, ashnerenovably seated in soidbasei, a die edimtab'liy on said shoe nndtwomeans ioir hol die, one of said means being a direct-commation betweensaid die udshoe and sewing: perevent lateral die movement, andthe 0 adirect, transversely amending my nectml between said the endaidiramein-e dependent of saidl shoe, and. arcing tom: ventdepthwise diemovement.

it base and two uprights laterally adjustable thercmn. a verticallyrecipmtr miner" guided: insuid uprights, a die-ho dingshoe having adovetailed md'ustahh connection with said base and a. die adjustableconnection with saidshue, in cow bination with means forming; indirections net-tine between said die and. said tram, independently ofsaid shoe, for retainingothe die against displacement in the dizectionofsaid dovetailed connections, said eluding a bar extending transverselyof the machine and being movable with respect to] ormit remoml oi thedie from its dovetai QIWYQ. in i t t In testimony whereof, I have signedthis MORTON c. when.

wing in dovetailed;

15 8. In a drop hnmmer, :1 mm comprising i

